Isle of Wight · England
Sand Mastic in Bonchurch
Sand mastic for Bonchurch, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Silicone on a period window that looks wrong
- Draughty sash windows at the surround
- Mastic dropping out of the joint
Sand mastic for homes and businesses in Bonchurch
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant and we will explain which is best for yours. We work on period & listed homes, stone surrounds and sash and case windows, and people most often call us about wind and rain getting in round a sash window and cement or filler used on old window joints that has cracked.
In a village or hamlet like Bonchurch, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these don’t always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
Whatever the size of the job, it’s backed by our 12-month guarantee in Bonchurch and across the Isle of Wight.
- Location
- Bonchurch (PO38)
- Wider area
- Isle of Wight
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in Bonchurch
Does the coastal weather in Bonchurch affect outside sealant?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Will you come out to Bonchurch?
Yes. Bonchurch is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
What do you need from me for a quote?
Let us know what needs doing and where, plus photos if you have them. We will ask anything else we need to know.
Can I choose the sealant colour?
We’ll suggest a colour to suit the surroundings, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Can sand mastic be painted?
The usual advice is to leave sand mastic unpainted. If you are redecorating the window, ask us first and we will advise.
How long does sand mastic take to harden?
It skins over fairly quickly but takes longer to harden fully. We will tell you what to expect for your job.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Can you replace silicone on a period window with sand mastic?
Yes. The silicone is cut out and the joint cleaned, then point it with sand mastic.
Different surfaces, different methods
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.
Signs you need sand mastic in Bonchurch
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
The most common problems we see are:
- Gaps round a timber door in stone or brick
- Patchy fillers round a sash window
- A silicone bead on a sash window that spoils the look
- Draughts and rain around sash boxes
For landlords with property near Shanklin station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Questions to ask before booking
- The length of the guarantee
- Who does the work, and how experienced they are
- How the joint is cleaned and prepared
- When the joint can take water or movement
Why deal with it now?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. Older cottages and farmhouses around Bonchurch can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why us?
- Experience in homes, commercial sites and hotels
- Fully insured
- We never seal over old sealant
- More than 20 years in sealant work
Take a look at what affects the cost and what customers say.
When it is not the sealant
We will not take on work that will not last, so here’s what sealant can’t put right:
- Planning or listed building consent (your local planning authority decides)
- Cracked or broken glass
- Sash cords, weights and draught-proofing of the sashes
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly.
Surfaces we seal
- Timber door frames
- Tenement windows
- Sash and case windows
- Stone surrounds
- Brick reveals
- Period & listed homes
How the visit works
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes anything from a few hours to a full day, depending on how many windows. Somewhere like Bonchurch needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Tell us about any water getting in
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before we start.
Advice
What sand mastic looks like in Bonchurch
Bonchurch is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Historic houses like Rylstone Manor (about 1.8 miles north) are a reminder that the area around Bonchurch has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
For an older house near a landmark such as Old St. Boniface Church, the joint between an old wall and a newer frame is generally the first place rain gets in. If you look after a building such as St Catherine's School, larger buildings have plenty of frames, and the mastic around each one ages.
Bonchurch is about 2 miles south of Shanklin, in the Isle of Wight. Jobs in Bonchurch get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our the Isle of Wight coverage runs to 125 places, and Bonchurch is one of them. Our Portsmouth page covers work nearby, about 15 miles away.
Our applicators cover all of PO38 for sand mastic. Whether your property is on Shore Road, Leeson Road and Bonchurch Village Road or anywhere close by, we can help. Other places close to Bonchurch include Luccombe Village (1 mile north), Ventnor (1 mile west), Steephill (2 miles west), Wroxall (2 miles north-west) and Shanklin (2 miles north). Further out, we also cover Newport (9 miles north-west), Ryde (9 miles north), Cowes (12 miles north-west), Sandown (4 miles north), East Cowes (12 miles north-west) and Oakfield (8 miles north). Island and remote addresses take a little more planning, so tell us where you are when you ask for a quote.
Landmarks near Bonchurch
In Bonchurch, that means homes and buildings near Bonchurch Inn. The closest station to Bonchurch is Shanklin station, roughly 2.4 miles north of the centre. Well-known places in the area include Sandown Castle (4.3 miles north) and Arthur Webster Memorial Hospital for Children (2.5 miles north). Open spaces near Bonchurch include Alverstone Mead and St Boniface Down.
What affects the quote in Bonchurch
Jobs vary more than people expect. What affects the quote:
- Any working-time requirements on site
- The size of the job
- How much old sealant there is and how hard it is to remove
- The product the joint needs
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we’ll explain what it covers.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
- If it’s domestic, commercial or a hotel
- Photos by email, if that’s easy
We don’t publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or send us an email.
Landlord and commercial work in Bonchurch
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
For anyone letting property in or around Bonchurch, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.